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l W..P. RIDDER. SAFETY DI'IYIGE'POR BLEVATURS. v

No. 543,153. Pat'ntedJuly 23, 1895.

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W. P. KIDDER. SAFETY DEVIGBD FOR ELEVATORS.

No. 543,153.u 'Patented July 2%1895.

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W. P. KIDDER. SAFETY DEVICE EOE 'ELEMTQRSl No. 543,153. Patented Julyv23, 1895 Strom/m NrTeD STATES ATnNr OFFICE.

WELLINGTON P. KIDDER, OF BOSTON, MASSACHUSETTS, ASSIGNOR TOTHE KIDDERELEVATOR INTERLOOK COMPANY, OF NEW YORK, N. Y. I

SAFETY DEVICE FOR ELEVATORS.

SPECIFICATION fOlming part f Letter-S Patent N0; 543,153, dated. July23, 1895.

Application filed May 8,1895. Serial No. 548,596. (No model.)

.To all whom it may concern.-

Be it known that 1, WELLINGTON P. KID- DER, a citizen of the UnitedStates, residing at Boston', in the county of Suolk and State ofMassachusetts, have invented a certain new and useful Improvement inSafety Devices for Elevators,` of which the following is aspecilication, reference being had to the accompanying drawings. Y v

This improvement relates to that class of safety devices forelevatorswherein the hoisting apparatus cannot be set in motion while a well-dooris open, nor a well-door opened while the car is in motion; and itsobject is to provide a device of thisV kind which' will bevery reliable,cheaply made, easily applied, and not likely to get out of order.

To these ends the invention consists in the mechanism hereinafter moreparticularly described and then definitely claimed at ythe end hereof.

In the accompanying drawings, Figure 1 represents a vertical vsection ofan elevator well and car provided with my improvement and with part of`the front of the car. broken away. Fig.'2 isa vertical section on theline ww, Fig. 1. Fig. 3`is a similar section-with some of the parts inadifferent position. Fig. 4 is a bottom plan of the car. Fig. 5 is anelevation of part of the front of the car. Figs.

6 and 7 are modifications which will be more fully describedhereinafter. Fig. 8 is an enlarged detail of alatch-operator.

Referring now to the details of the drawings by gures, l represents thevwelll provided with doors 2, each having a bar or projection 3 thereonand sliding on guides 4. Fastened by screws or otherwise to the lowerguides are L-shaped brackets 6, the horizontal part forming a guide forawire or rod 7, hereinafter further described-and a support forA adoor-fastener or alatch 8 pivoted at 9 to the vertical part of thebracket 6, and normally dropping behind the end of the bar 3, wherebythe door is prevented from being opened as long as the latchis down, asshown in the lower part of Fig. 1.

The Wire or rod 7 may be suspended from a lever 10, from the oppositeend of which hangs a weight 11 to keep the wire taut, or a spring 12 maybeemployed for the same purpose, or both weight and spring may be usedif preferred. The lower end of the Wire is connected to a bell-cranklever 13, carrying a weight 14, whichshould be heavy enough to overcomethe weight 11 or spring 12, or both of them if both are employed. Thelower end of the lever forms a detent 13', which engages with a notch 16in the pulley 16, which represents the ordinary pulley commonly used tomove the valve shaft or stem 17. These two coact-ing parts-the detentand the notched pulley-thus form a lock, as they prevent any movement ofthe valve.

Attached to the bottom of the car 15 is a block 18, and pivoted at 19 tosaid block is a 'lever 20, carrying a foot-piece 2l and a catch 22, bothpivoted to said lever, as shown. The upper'end of the catch 22 works ina guide 23 and is toothed, as shown at Fig. 8. Its lower end is acted onby a spring 25, the fixed end of which isv securedto the block 18.

' Firmly secured to y'the wire 7 in any convenient manner are blocks 26,one at each door, and they are so arranged that when a latch is lifted,so as to allow a door to open, said latch bears'on the under side of theblock just above it and moves the wire upward.

The operation is as follows: ASupposing the car is just about to stop orhas stopped, the operator presses his footupon the foot-piece 21, whichdepresses the lever 2O and the` catch 22, causing lone ofthe teethof thelatter to catch on the short end of the latch 8, and thus through theblock'next above it, raising the Wire 7, which will operate thebell-crank lever 13, and cause the detent 13' to enter the notch 16 inthe pulley or disk 16,"and thus lock the valve shaft or stem fromturning. When in this position, the Well-door opposite the car can beopened, and when opened the bar or stop 3 will hold the latchrS in itsraised position, which in turn will keep thewire 7 raised, and thelatter will hold the detent 13 in the notch 16 in the pulley 16, so thatas long as the door is open the valve of the hoisting apparatus cannotbe operated, but when the door is closed thelatch will descend, thusallowing the detent I3 to leave the notch 16 under the force of theweight llt.

From the foregoing it will be seen that this apparatus forms a perfectlock for the valve, the movement of which is governed entirely by theposition of the well-doors, so that the valve cannot be operated while awell-door is open; nor can any well-door be opened unless the car isopposite said door and the valve is in the closed position, for if anattempt be made to open a well-door when the valve is open and the carin motion the detent I3 will come in contact with the periphery of thepulley and will thus be prevented from moving sufficiently to allow ofthe opening ofthe door, and perfect safety is thus secured under allcircumstances.

Instead of the weight or spring for keeping the wire taut, I maysometimes use a returnwire, as shown in Fig. 6, in which case a T-shaped lever 13 will have to be used, or instead of a Wire I may use astift rod 7', as shown in Fig. 7.

Instead of making the notch 16 in the ordinary pulley on the valve-stem,I may use a separate disk or casting of suitable form connected wit-hsaid shaft. For convenience in drawing the claims, I shall call saidpulley or disk and the coasting detent a valve-lock, for, as beforestated, they constitute a lock that prevents the valve from being moved,meaning to include in said term not only the usual pulley on the valveshaft .or stem, but any device connected with said valve shaft or stemby which the valve is locked fast by the coaction of said device and adetent controlled by the position of a well-door.

It is obvious that the wire shown in Fig. l and the rod shown in Fig. 7both operate the detent by tensile strain, and that stiffness is notrequired, but either will accomplish the desired object, and not onlymay a wire or rod be employed, but a rope or chain, also, although Iprefer a wire. In view of this and in order to cover either form ofdevice for operating the detent, I shall in the following claims referto the wire or rod as a detent.- operator, except in specific claims,where the wire may be specially mentioned, and mean to include in suchterm either a wire, rod, rope, chain, or equivalent device.

What I claim asnew isl. The combination in an elevator and with awell-door and the valve mechanism thereof, of a door-fastener, avalve-lock operating directly upon said Valve mechanism and independentof the operating rope, and intermediate connections between thevalve-lock and door-fastener for holding the valve locked when thefastener is in position to allow the door to be opened, substantially asdescribed.

2. The combination in an elevator and with a well-door and the valvemechanism thereof,

of a door-fastener, a valve-lock operating di rectly upon said valvemechanism and independent of the operating rope, intermediateconnections between the valve-lock and doorfastener for holding thevalve locked when the fastener is in position to allow the door to beopened, and a car provided with means for operating the door-fastener,substantially as described.

3. The combination in an elevator and with a well-door and the valvemechanism thereof, of a door-fastener, a valve-lock operating directlyupon said valve mechanism and independent of the operating rope,intermediate connections between the valve-'lock and door- .fa'stenerfor holding the valve locked when the fastener is in position to allowthe door to be opened, and a car provided with means operated by thefoot for operating the doorfastener, substantially as described.

4. The combination in an elevator and with a well-door and thevalve-operating mechanl erated by said foot lever and operating on the'fastener, substantially as described.

5. The combination in an elevator and with the well-door and thefastener thereof, of a car, a foot-lever 'and a toothed catch foroperating the fastener, substantially as described.

6. The combination in an elevator and with a well-door and thevalve-operating mechanism thereof, of a door-fastener, a valve-lock,intermediate connections between the valvelock and door-fastener, and aprojection on the well-'door to hold the fastener in araised position,substantially as described.4

7. The combination in an elevator and with a well-door and thevalve-operating mechanism thereof, of a door-fastener, a valve-lock,intermediate connections between the valvelock and door-fastener, aprojection on the well-door to h old the fastener in a raised positionand the locking device in engagement, substantially as described.

8. The combination in an elevator and with a well-door and the valvemechanism thereof, of a door-fastener, a valve-lock operating directlyupon said valve mechanism and independent of the operating rope, adetent-operator moved by said fastener and operating the valve-lock,substantially as described.

9. The combination in an elevator and with a well-door and thevalve-operating mechanism thereof, of a door-fastener, a detent-operatormoved by said fastener, and a detentconnected with the detent-operator,and a vdisk on the valve-shaft or stem having a notch to receive thedetent, substantially as described.

10. The combination in an elevator and with tof;

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illel Well-doors and oar thereof, of a wire 7 In testirnony whereof Iaffix my signature, running parallel with said doors, blocks 26 inthepresence of two Witnesses,this 27th day 1o on said Wire,latohes S forfastening the doors of April, 1895. closed operated by said blocks atension dev V5 vice for keeping the Wire taut,a lever 13 pro- WELLUNGTON P' KIDDER' vided with a detent 13.', and a disk 16 on theWitnesses: v valve-shaft having a notch 16 to receive the WILLIAM J.MILLER, detent, all substantially as described. 4 R. S. BARROWS.

